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TFSA680RJE Datasheet(PDF) 2 Page - Ohmite Mfg. Co. |
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TFSA680RJE Datasheet(HTML) 2 Page - Ohmite Mfg. Co. |
2 / 2 page 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 58 Although Ohmite’s TFS Series resistors have been specially designed and developed to absorb much more energy than standard resistors, pulses and transients require special consideration since they cause an instantaneous temperature rise in the resistor film. This application note can guide you through these considerations. For applications with transients, pulses or surges the following must be consid- ered: 1. Do not exceed the normal rated oper- ating voltage of the device. 2. Using the figure at right, estimate the energy (Ea) and the pulse duration (ta) for a single pulse in your applica- tion. 3. Calculate the energy ratio in percent (Er) between the nominal energy rat- ing of the model you have chosen (see table) and the single pulse energy in your application (Ea from step 2) using the formula: Ea Er = –––––––– x 100 Enominal 4. Refer to the Pulse Chart. On this chart find the point where the energy ratio (Er), found at step 3, and time (ta) coincide. Qualify that this point falls below the maximum pulse energy curve. If the point is above the curve a bigger model should be chosen. V t V t V t V t E = ––– V2t R E = ––– V2t 3R E = ––– V2t 3R E= Energy (joules) t= Time (seconds) V= Voltage (volts) R= Resistance (ohms) C= Capacitance (farads) E = –CV2 1 2 t = RC Example A 1µF capacitor is charged to 3.5kV and model TFSC, 1KOhm has been selected. Model TFSC is rated for 4kV, so the peak volt- age of 3.5kV is acceptable. 1 Ea = –– CV2 = 6.1J 2 ta = R C = 1 ms 6.1J Er = ––– x 100 = 55% 11J According to the pulse chart, an energy ratio of 55% for a pulse width of 1ms falls well above the energy curve. The limit is actually located around 25-30%. Model TFSC cannot be used for this application. A bigger model should be chosen, for example TFSD. Model TFSD, 1KOhm, can be used for this application because we have an energy ratio Er of 18%, which is below the energy curve. 6.1J Er = ––– x 100 = 18% 33J Ohm Value Example: 100R = 100Ω 2K40 = 2400Ω Tolerance F = 1% G = 2% J = 5% K = 10% Series T F S A 1 0 0 K J E Energy Rating joules A = 6 B = 9 C = 11 RoHS Compliant D = 33 E = 44 F = 55 Standard Part Numbers for TFS Series 6 Joules 9 Joules 11 Joules 33 Joules 44 Joules 55 Joules Ohms Tol. 0.5 Watts 0.5 Watts 0.75 Watts 1 Watts 1.5 Watts 2 Watts 100 1% TFSA100RFE 100 5% TFSB100RJE TFSD100RJE TFSF100RJE 220 1% TFSA220RFE 270 5% TFSA270RJE TFSC270RJE TFSD270RJE TFSF270RJE 470 1% TFSA470RFE 470 5% TFSB470RJE TFSE470RJE 680 5% TFSA680RJE TFSC680RJE TFSE680RJE TFSF680RJE 750 5% TFSB750RJE TFSD750RJE TFSF750RJE 1,000 1% TFSA1K00FE 1,000 5% TFSA1K00JE TFSB1K00JE TFSC1K00JE TFSD1K00JE TFSE1K00JE TFSF1K00JE 1,500 5% TFSA1K50JE TFSC1K50JE TFSD1K50JE TFSF1K50JE 2,200 1% TFSA2K20FE 2,700 5% TFSB2K70JE TFSE2K70JE 4,700 1% TFSA4K70FE 4,700 5% TFSA4K70JE TFSC4K70JE TFSD4K70JE 4,990 1% TFSA4K99FE 5,000 5% TFSA75K0JE 6,800 5% TFSB6K80JE TFSE6K80JE 10,000 1% TFSA10K0FE 10,000 5% TFSA10K0JE TFSB10K0JE TFSC10K0JE TFSD10K0JE TFSF10K0JE 16,000 5% TFSF16K0JE 20,000 1% TFSA20K0FE TFSF20K0JE 20,000 5% TFSB20K0JE TFSD20K0JE 22,000 1% TFSA22K0FE 27,000 5% TFSA27K0JE TFSC27K0JE TFSE27K0JE 47,000 1% TFSA47K0FE 50,000 5% TFSA50K0JE TFSF51K0JE 51,000 5% TFSB51K0JE TFSC51K0JE TFSD51K0JE 75,000 5% TFSE75K0JE 100,000 1% TFSA100KFE 100,000 5% TFSB100KJE TFSC100KJE TFSD100KJE TFSF100KJE tFs series Surge Capable Thick Film Non Inductive s ingle p ulse e nergy r ating o rdering in F ormation Maximum Individual Pulse Rating Pulse Width 1µs 10µs 100µs 1 ms 10 ms 100 ms 0.1 1000 1 10 100 |
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